Direct Reading Wave-Meter Type 174

General Radio Company; Cambridge (MA)

Data
Forum
Pictures
Collections

  • Year
  • 1919 ?
  • Category
  • Service- or Lab Equipment
  • Radiomuseum.org ID
  • 313805
    • alternative name: GenRad

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Main principle
  • Crystal or Solid State Detector
  • Tuned circuits
  • 1 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Direct Reading Wave-Meter Type 174 - General Radio Company;
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes

  • Wave meter (closed oscillatory circuit type) with 3 ranges, covering 130m to 3000m. Indication by crystal detector and hot-wire ammeter, readout by three scales calibrated in wavelengths on variable condenser.

    Includes buzzer for operation as generator of damped oscillations.

     

  • Price in first year of sale
  • 68.00 $
  • Mentioned in
  • Atlantic Radio Co. Bulletin 14 (1919)
  • Author
  • Model page created by Nikolaus Löwe. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model Direct Reading Wave-Meter is part of the collections of the following members.

 Forum

Forum contributions about this model: General Radio: Direct Reading Wave-Meter Type 174

Threads: 1 | Posts: 1

Inside the wooden housing of the GR 174B wavemeter is a square bracket and spring contacts surrounding an obvious space for a battery.  In the 1920's, the Eveready 771 "C" battery measured 4" wide, 3" tall and 1.3" deep.  It exactly fits the space, and the 4.5 V is about right to drive the buzzer.  The 771 was a very common battery back then, and I could find no other battery that even came close to the right size and voltage.  Most 771 batteries came with Fahrensotck clip connectors, but I think there were versions with simple flat contacts.  So, I think it is pretty obvious that the GR 174B used a 4.5V Eveready 771 battery.  BTW it's very easy to 3D print or otherwise construct a box of the right size and stuff it with 3 or 6 modern C batteries.  

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Douglas Burum, 03.Sep.22

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